GetWindowRect(&m_rcMain);//restore the src screen's size;
//delete the showing window's caption
LONG style = GetWindowLong(m_hWnd,GWL_STYLE);
style &=~WS_CAPTION;
//set the window's show sytle
SetWindowLong(m_hWnd,GWL_STYLE,style);
//get the screen's pixel
int screenX = GetSystemMetrics(SM_CXSCREEN);
int screenY = GetSystemMetrics(SM_CYSCREEN);
//show window
SetWindowPos(NULL,0,0,screenX,screenY,SWP_NOZORDER);